Stirrup frame for hydraulic press

ABSTRACT

A hydraulic press comprises a stirrup frame with a fixed crosshead and a movable cross-head, the frame having bearing plates connected to one another. Two pairs of side plates fasten the bearing plates together at the sides thereof, with provision for linear displacement for the side plates in the direction of the press operating force and optionally for relative rotation in their own plane.

United States Patent Budman et al.

[54] STIRRUP FRAME FOR HYDRAULIC PRESS Marata, 5, kv. 3; Eduard Sebostyanovich 1 Slavetsky-Kovitsky, Oktyabrssky poselok, Shlakobetonny dom 7, kv. 2; Leonid Pavlovich Shorokhov, ulitsa Sotsialisticheskaya', 69, kv. 65, all of Krama- [1 1 3,668,921 [451 June 13, 1972 Primary Examiner-Charles W. Lanham Assistant Examiner-Gene P. Crosby Anomeywaters, Roditi, Schwartz & Nissen 57 ABSTRACT torsk, U.S.S.R.

A hydraullc press comprises a stirrup frame with a fixed cross- [22] Filed: Oct. 10, 1969 head and a movablecross-head, the frame having bearing J 9 plates connected to one another. Two pairs of side plates [211 No 865,30 fasten the bearing plates together at the sides thereof, with provision for linear displacement for the side plates in the U.S. ..72/455, direction of the ress operating force and optionally for rela- [5 l Int- Cl- .-B21J five rotation in their own [58] Field of Search ..72/455, 456; 453; 100/214,

- 100/269 R 7 Claims, 4 Drawing Figures l5 j fi If /4 m lil , 1 STIRRUP FRAME FOR HYDRAULIC PRESS The present invention relates to stirrup frames of hydraulic presses used in metallurgical and machine-building industries for forging, stamping and pressing operations and in manufacturing artificial superhard materials.

, Known in the art are stirrup frames for hydraulic presses wherein a number of separate bearing plates are connected to one another.

In the known stirrup frames separate bearing plates are usually interconnected by studs over the entire surface. However this type of connection of the bearing plates in the stirrup frames for hydraulic presses has the following disadvantages.

Joining of the bearing plates by studs over the entire surface weakens the critical sectionsof the plates and fails to ensure a required stiffness of the frame in a direction perpendicular to the surfaces of said plates. The stiffness of the frame in this direction depends upon the number of interconnected bearing plates, An increased number of bearing plates increases the dimensions and weight of the frame and, consequently, of the press as a whole. This requires a larger amount of work in manufacturing and assemblying the press and increases its manufacturing cost.

An object of the present invention resides in aforesaid disadvantages.

The main object of the present invention consists in providing a simple and reliable stirrup frame for hydraulic presses which will be sufficiently strong and stiff and be easier to manufacture and assemble the press along with a lower cost.

This object is achieved by providing a stirrup frame for a hydraulic press in which, according to the invention, the bearing plates are fastened by other plates, installed at the sides of the bearing plates with provision for displacement in the direction of the working force of the press or for said displacement combined with turning in their plane.

1 It is preferable that the bearing plates are fastened at each side by two fastening plates facing each other and installed with provision for'relative displacement in the direction of the press operating force, or for said displacement combined with turning in their plane.

lt is also preferable that the bearing plates be combined into two assemblies which can be fastened to each fastening plate by means of a longitudinal beam installed in slots made on the sides of the bearing plates, said beam being connected to said fastening plate by studs, andby means of a transverse beam located between the assemblies of the bearing plates, its end being fittedinto a cutout in said fastening plat It is desirable that the capability of relative displacement of the fastening'plates in the direction of the press working force be obtained by providing a tenon on that end of one fastening plate which faces the other plate, the latter being provided with a slot receiving said tenon.

The capability of turning the fastening plates in their planes and of their relative displacement in the direction of the press operating force can be achieved by providing a fork at the end of one fastening plate facing the other fastening plate, this fork having an articulated slide block, and by forming a slot in the other fastening plate, said slot receiving said slide block.

Now the invention will be described by way of example with reference to the accompanying drawings, in which:

FIG. 1 is a front view of a hydraulic press with a stirrup frame i FIG. 2 is a side view thereof I FlG. 3-is a side view of the press showing one embodiment of interconnecting the fastening plates by the ends facing each other; and

FIG, 4 is a section taken along line lVlV of FIG. 3.

In describing the present embodiment of the invention, terms are used in their narrow sense for the sake of lucidity. However, the invention is not confined to the narrow sense of the terms used and it will be understood that each of said terms embraces all the equivalent elements functioning similarly and employed for the same purposes.

eliminating the The hydraulic press comprises a stirrup frame 1 (FIG. 1) installed on a foundation 2 a stationary cross-head 3 and a working power cylinder 4 with a movable cross-head 5, both being installed in a port 6 of the frame 1. The movable crosshead 5 is connected with return power cylinders 7. Fastened to the stationary cross-head 3 is a bottom die 8 while the top die 9 is secured to the movable cross-head 5.

The stirrup frame 1 comprises a number of separate bearing plates 10 (FIG. 2 interconnected by studs 11 (FIG. 1). According to the invention, the bearing plates 10 (FIG.2) are fastened at each side by fastening plates 12 and 13 which face each other and can be displaced relative to each other in the direction of the press operating force or can be so displaced and, concurrently, turned in their own plane. It is understood that, according to the invention, the bearing plates 10 can be held together by only one fastening plate at each side (This version is not illustrated in the drawings). This will not affect the stiffness and strength of the frame.

The bearing plates 10 are combined into two assemblies. Said assemblies are fastened to each fastening plate 12 or 13 by means of a longitudinal beam 14 installed in slots 15 F 1G. 1) in the sides of said bearing plates, and connected with said fastening plate by studs 16. Located between the assemblies of the bearing plates 10 at each side of the press is a transverse beam 17 whose end fits into a cutout 18 (FIG. 2) in the fastening plates 12 or 13.

V The possibility of relative displacement of the fastening plates 12 and 13 in the direction of the press operating force is ensured by means of a tenon 19 at the end of the fastening plate 12, facing the fastening plate 13. The end of the fastening plate 13 facing the plate 12, has a slot 20, receiving said tenon 19.

The possibility of turning the fastening plates 12 and 13 in their own plane and their relative displacement along the press operating force is provided by the fork 21 (FIGS. 3 and 4) located on the end of the plate 12 facing the plate 13, and articulated to a slide block 22. Said slide block is accommodated in a slot 23 at the end of the side plate 13 facing the fastening plate 12. The slide block 22 is articulated to the fork 21 by a pin 24.

During press operation, when the resultant force of the press coincides with the press axis, the frame 1 is subjected only to vertical axial forces which are resisted by the bearing plates 10. If the resultant force fails to be in line with the press axis, there arises a moment, which turns the movable crosshead 5 with respect to the fixed cross-head 3. In this case, in addition to the vertical axial forces, the frame 1 is subjected to horizontal forces which shift the side portions of the bearing plates 10 relative to one another. When the horizontal forces act laterally, they are resisted by the bearing plates 10 whose stiffness determines the stiffness of the frame 1 in this direction.

If the horizontal forces act in a longitudinal direction, they are resisted by the fastening plates 12 and 13 which are fastened to the bearing plates 10 and connected to each other by the tenon l9 and the slot 20 or by the slide block 22 and slot 23. The stiffness of the frame 1 in this direction is determined by the stiffness of the plates 12 and 13.

If the horizontal forces act in other directions, they are resisted both by the bearing plates 10 and the fastening plates 12 and 13 which, taken together, determine the stiffness of the frame 1 in these directions.

The connection of the plates 12 and 13 with provision for their relative displacement in the direction of the press operating force relieves said plates and the parts fastening them to the plates 10, from the vertical axial forces.

The embodiment of connecting the plates 12 and 13, with the possibility of their mutual displacement in the direction of the press working force and mutual turning in their own planes, compensates for the difference in the turning angles of the parts of said plates being connected which may occur in operation, and for possible assembly errors.

The advantages of the stirrup frame for the hydraulic presses according to the invention, are as follows.

Connection of the bearing plates by means of the plates 12 and 13 eliminates the weakening of the plates 10 at the critical sections by the holes for the studs, ensures sufiicient stiffness of the frame 1 in a direction perpendicular to the planes of said bearing plates 10, reduces the labor requirement in manufacturing and assemblying the press and reduces its cost.

While a specific embodiment of the invention has been disclosed in the description, it will be understood that various modifications and changes within the spirit and the scope of the invention may occur to those skilled in the art.

These changes and modifications can be resorted to without departing from the scope of the invention as hereinafter defined by the appended claims.

What is claimed is:

1. A hydraulic press comprising a stirrup frame; a fixed cross-head installed in the frame; a working power cylinder installed in the frame, a movable cross-head secured to the power cylinder to develop a press operating force, return power cylinders for lifting the movable cross-head; said frame including bearing plates connected to one another, side plates to fasten said bearing plates at the sides thereof, and means connecting said side plates at the sides of said bearing plates with provision for relative displacement in the direction of the press operating force.

2. A press as claimed in claim 1, wherein said means connecting the side plates at the sides of the bearing plates provides the capability for said side plane.

3. A press as claimed in claim 1, wherein said side plates are arranged in pairs at opposite sides of the bearing plates, the side plates in each pair facing one another.

4. A press as claimed in claim 3, wherein said means connecting the side plates at the sides of the bearing plate provides the capability for said side plates to turn in their own plane.

5. A press as claimed in claim 3, wherein said bearing plates are connected into two assemblies, said means which connects the side plates to the bearing plates comprising four longitudinal beams, said bearing plates having slots to receive said beams, studs connecting the side plates to the beams, and two transverse beams located between the assemblies of bearing plates, said side plates having cutouts to receive the ends of the transverse beams.

6. A press as claimed in claim 5, wherein said means connecting the side plates includes a tenon on one side plate of a pair, the other side plate of the pair having a slot slidably receiving said tenon.

7. A press as claimed in claim 5, wherein said means connecting the side plates comprises a fork on one side plate, the other side plate having a slot, a slide block in said slot, and means pivotably connecting said fork to said slide block.

i k i plates to turn in their own 

1. A hydraulic press comprising a stirrup frame; a fixed crosshead installed in the frame; a working power cylinder installed in the frame, a movable cross-head secured to the power cylinder to develop a press operating force, return power cylinders for lifting the movable cross-head; said frame including bearing plates connected to one another, side plates to fasten said bearing plates at the sides thereof, and means connecting said side plates at the sides of said bearing plates with provision for relative displacement in the direction of the press operating force.
 2. A press as claimed in claim 1, wherein said means connecting the side plates at the sides of the bearing plates provides the capability for said side plates to turn in their own plane.
 3. A press as claimed in claim 1, wherein said side plates are arranged in pairs at opposite sides of the bearing plates, the side plates in each pair facing one another.
 4. A press as claimed in claim 3, wherein said means connecting the side plates at the sides of the bearing plate provides the capability for said side plates to turn in their own plane.
 5. A press as claimed in claim 3, wherein said bearing plates are connected into two assemblies, said means which connects the side plates to the bearing plates comprising four longitudinal beams, said bearing plates having slots to receive said beams, studs connecting the side Plates to the beams, and two transverse beams located between the assemblies of bearing plates, said side plates having cutouts to receive the ends of the transverse beams.
 6. A press as claimed in claim 5, wherein said means connecting the side plates includes a tenon on one side plate of a pair, the other side plate of the pair having a slot slidably receiving said tenon.
 7. A press as claimed in claim 5, wherein said means connecting the side plates comprises a fork on one side plate, the other side plate having a slot, a slide block in said slot, and means pivotably connecting said fork to said slide block. 